Two Switch Forward and Flyback Power Supply Controller 16-Pin ESIP-F

The HiperTFS-2 device family members incorporate both a high-power two-switch-forward converter and a mid-power flyback (standby) converter into a single, low-profile eSIP™ power package. The single chip solution provides the controllers for the two-switch-forward and flyback converters, high- and low-side drivers, all three of the high-voltage power MOSFETs, and eliminates the converter’s need for costly external pulse transformers. The device is ideal for high power applications that require both a main power converter (two-switch forward) up to 586 W peak, and standby converter (flyback) up to 20 W. HiperTFS-2 includes standard set of comprehensive protection features, such as integrated softstart, fault and overload protection, and hysteretic thermal shutdown. HiperTFS-2 utilizes advanced power packaging technology that simplifies the complexity of two-switch forward layout, mounting and thermal management, while providing very high power capabilities in a single compact package. The devices operate over a wide input voltage range, and can be used following a power-factor correction stage such as HiperPFS.Two-switch-forward power converters are often selected for applications demanding cost-effective converters that have high efficiency, fast transient response, and high rejection to line voltage variation. The two-switch-forward controller incorporated into HiperTFS-2 devices improves on the classic topology by allowing operation considerably above 50% duty cycle. This improvement reduces RMS current conduction losses, minimizes the size and cost of the bulk capacitor, and minimizes output diode voltage ratings. The advanced design also includes transformer flux reset control (saturation protection) and charge-recovery switching of the high-side MOSFET, which reduces switching losses. This combination of innovations yields an extremely efficient power supply with smaller MOSFETs, fewer passives and discrete components, and a lower-cost smaller transformer.

• Protected Two-Switch Forward and Flyback Combination Solution
  • Incorporates three high-voltage power MOSFETs, main and standby controllers, and gate drivers
  • Level shift technology eliminates need for pulse transformer
  • Programmable line under voltage (UV) detection prevents turn-off glitches
  • Programmable line overvoltage (OV) detection; latching and non-latching
  • Accurate hysteretic thermal shutdown (OTP)
  • Accurate selectable cycle-by-cycle current limit (main and standby)
  • Line compensated standby MOSFET current limit for standby over power compensation (OPC)
  • Fully integrated soft-start to minimize start-up stress
  • Simple fast AC reset
  • Reduced EMI
  • Synchronized 66/132 kHz forward and 132 kHz flyback converters
  • Frequency jitter
  • Eliminates up to 30 discrete components for higher reliability and lower cost
• Asymmetrical Two-Switch Forward Reduces Losses
  • Allows >50% duty cycle operation
  • Reduces primary-side RMS currents and conduction losses
  • Minimizes the size and cost of the bulk capacitor
  • Allows reduced capacitance or longer hold-up time
  • Allows lower voltage output diodes for higher efficiency
  • Transformer reset control
  • Prevents transformer saturation under all conditions
  • Extends duty cycle to satisfy AC cycle drop out ride through
  • Duty cycle soft-start
  • Satisfies 2 ms - 20 ms start-up with large capacitance at output
  • Self-biased high-side driver eliminates high-side bias winding (66 kHz)
  • Remote-on/off function
  • Voltage-mode controller with current limit
• 20 W Flyback with Selectable Power Limit
  • Tiny Switch-III based converter
  • Selectable power limit (10 W, 12.5 W, 15 W, 20 W)
  • Built-in overload power compensation (OPC)
  • Flat overload power vs. input voltage
  • Reduces component stress during overload conditions
  • Reduces required design margin for transformer and output diode
  • Output overvoltage (OVP) protection with fast AC reset
  • Latching, non-latching, or auto-restart
  • Output short-circuit protection (SCP) with auto-restart